Leap High MSM for Dogs - 100% Made in the USA, Nothing Imported - Relieves Joint Pain and Arthritis - All Natural MethylSulfonylMethane Supplement - 100% Guarantee - 1 Lb. of Powder - Just Add to Food - Your Dog Will Leap for Joy! 100% guaranteed. Comes in 1-pound bottles. MSM supports joint health and promotes general skin and coat health. 100% Made in the USA (nothing is imported). Ingredients: PurforMSM by Bergstron Nutrition, Inc. MSM is a naturally occurring sulfur compound.